S-90342A113 4-40 x 1/2" Alloy Steel Socket Head Screws with Split Lock Washer
Alloy Steel Socket Head Screws with Split Lock Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating protecting against rust in demanding industrial environments
- Exceptional tensile strength of 180,000 psi ensures reliable performance under high-stress applications
- Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
- Integrated split lock washer maintains consistent clamping force and prevents loosening from vibration
- Rockwell C39 hardness rating delivers excellent wear resistance and long-term durability
- Standard hex socket drive allows for easy installation with common tools in confined spaces
- Full regulatory compliance with RoHS 3 and REACH ensures environmental and safety standards are met
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws with 4-40 UNC coarse threads are engineered to solve critical fastening challenges in industrial applications. The combination of 180,000 psi tensile strength and Rockwell C39 hardness provides exceptional resistance to shear forces and wear, making them ideal for high-vibration environments like machinery, automotive assemblies, and precision equipment. The integrated split lock washer maintains secure fastening under dynamic loads, while the black-oxide surface treatment offers reliable corrosion protection. The Class 3A thread fit ensures precise engagement in tapped holes, reducing the risk of cross-threading and improving assembly efficiency in manufacturing and maintenance operations.
Specification Summary & Compliance
This socket head cap screw features 4-40 UNC coarse threads with Class 3A precision fit for superior thread engagement. Manufactured to exacting standards with right-hand threading and fully threaded design for consistent performance. The assembly includes a split lock washer with 11/64" OD and 0.03" thickness. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
